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package com.oracle.graal.python.nodes.function.builtins;

import com.oracle.graal.python.builtins.PythonBuiltinClassType;
import com.oracle.graal.python.builtins.objects.function.PArguments;
import com.oracle.graal.python.nodes.ErrorMessages;
import com.oracle.graal.python.nodes.PRaiseNode;
import com.oracle.graal.python.nodes.classes.IsSubtypeNode;
import com.oracle.graal.python.nodes.object.GetClassNode;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.VirtualFrame;

/**
 * Equivalent of {@code wrapperdescr_call} in CPython. We use this wrapper only for type slots. The
 * assumption is that type slots are usually not called explicitly through the magic methods, so we
 * can afford the extra checks for slot wrappers.
 * <p>
 * TODO: handle this validation efficiently for wrappers of other builtin methods, where the
 * performance is more important.
 */
public final class WrapperDescrCall extends SlotWrapper {
    private final String name;
    private final PythonBuiltinClassType type;
    @Child IsSubtypeNode isSubtypeNode = IsSubtypeNode.create();
    @Child GetClassNode getClassNode = GetClassNode.create();

    public WrapperDescrCall(BuiltinCallNode func, String name, PythonBuiltinClassType type) {
        super(func);
        this.name = name;
        this.type = type;
    }

    @Override
    public Object execute(VirtualFrame frame) {
        Object self = PArguments.getArgument(frame, 0);
        Object selfClass = getClassNode.executeCached(self);
        if (selfClass != type && !isSubtypeNode.execute(selfClass, type)) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            throw PRaiseNode.raiseStatic(this, PythonBuiltinClassType.TypeError, ErrorMessages.DESCRIPTOR_S_REQUIRES_S_OBJ_RECEIVED_P, name, type, self);
        }
        return super.execute(frame);
    }
}
